


(function ($) {
    var types = ["DOMMouseScroll", "mousewheel"];
    if ($.event.fixHooks) {
        for (var i = types.length; i; ) {
            $.event.fixHooks[types[--i]] = $.event.mouseHooks;
        }
    }
    $.event.special.mousewheel = {setup:function () {
        if (this.addEventListener) {
            for (var i = types.length; i; ) {
                this.addEventListener(types[--i], handler, false);
            }
        } else {
            this.onmousewheel = handler;
        }
    }, teardown:function () {
        if (this.removeEventListener) {
            for (var i = types.length; i; ) {
                this.removeEventListener(types[--i], handler, false);
            }
        } else {
            this.onmousewheel = null;
        }
    }};
    $.fn.extend({mousewheel:function (fn) {
        return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
    }, unmousewheel:function (fn) {
        return this.unbind("mousewheel", fn);
    }});
    function handler(event) {
        var orgEvent = event || window.event, args = [].slice.call(arguments, 1), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
        event = $.event.fix(orgEvent);
        event.type = "mousewheel";
        if (orgEvent.wheelDelta) {
            delta = orgEvent.wheelDelta / 120;
        }
        if (orgEvent.detail) {
            delta = -orgEvent.detail / 3;
        }
        deltaY = delta;
        if (orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS) {
            deltaY = 0;
            deltaX = -1 * delta;
        }
        if (orgEvent.wheelDeltaY !== undefined) {
            deltaY = orgEvent.wheelDeltaY / 120;
        }
        if (orgEvent.wheelDeltaX !== undefined) {
            deltaX = -1 * orgEvent.wheelDeltaX / 120;
        }
        args.unshift(event, delta, deltaX, deltaY);
        return ($.event.dispatch || $.event.handle).apply(this, args);
    }
})(jQuery);

